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2. Intensity (physics) - Wikipedia

   en.wikipedia.org/wiki/Intensity_(physics)

   In physics and many other areas of science and engineering the intensity or flux of radiant energy is the power transferred per unit area, where the area is measured on the plane perpendicular to the direction of propagation of the energy.

3. List of physical quantities - Wikipedia

   en.wikipedia.org/wiki/List_of_physical_quantities

   Radiant intensity: I: Power of emitted electromagnetic radiation per unit solid angle W/sr L 2 M T −3: scalar Reaction rate: r: Rate of a chemical reaction for unit time mol/(m 3 ⋅s) L −3 T −1 N: intensive, scalar Refractive index: n: Factor by which the phase velocity of light is reduced in a medium unitless 1: intensive, scalar Reluctance

4. Inverse-square law - Wikipedia

   en.wikipedia.org/wiki/Inverse-square_law

   The energy or intensity decreases (divided by 4) as the distance r is doubled; if measured in dB would decrease by 6.02 dB per doubling of distance. When referring to measurements of power quantities, a ratio can be expressed as a level in decibels by evaluating ten times the base-10 logarithm of the ratio of the measured quantity to the ...

5. Radiant energy - Wikipedia

   en.wikipedia.org/wiki/Radiant_energy

   Radiant intensity: I e,Ω [nb 5] watt per steradian: W/sr: M⋅L 2 ⋅T −3: Radiant flux emitted, reflected, transmitted or received, per unit solid angle. This is a directional quantity. Spectral intensity: I e,Ω,ν [nb 3] watt per steradian per hertz W⋅sr −1 ⋅Hz −1: M⋅L 2 ⋅T −2: Radiant intensity per unit frequency or wavelength.

6. Radiant intensity - Wikipedia

   en.wikipedia.org/wiki/Radiant_intensity

   Radiant intensity is used to characterize the emission of radiation by an antenna: [2], = (), where E e is the irradiance of the antenna;; r is the distance from the antenna.; Unlike power density, radiant intensity does not depend on distance: because radiant intensity is defined as the power through a solid angle, the decreasing power density over distance due to the inverse-square law is ...

7. Schwarzschild's equation for radiative transfer - Wikipedia

   en.wikipedia.org/wiki/Schwarzschild's_equation...

   Schwarzschild's equation is the formula by which you may calculate the intensity of any flux of electromagnetic energy after passage through a non-scattering medium when all variables are fixed, provided we know the temperature, pressure, and composition of the medium.

8. Energy - Wikipedia

   en.wikipedia.org/wiki/Energy

   Examples of large transformations between rest energy (of matter) and other forms of energy (e.g., kinetic energy into particles with rest mass) are found in nuclear physics and particle physics. Often, however, the complete conversion of matter (such as atoms) to non-matter (such as photons) is forbidden by conservation laws .

9. List of optics equations - Wikipedia

   en.wikipedia.org/wiki/List_of_optics_equations

   In astrophysics, L is used for luminosity (energy per unit time, equivalent to power) and F is used for energy flux (energy per unit time per unit area, equivalent to intensity in terms of area, not solid angle). They are not new quantities, simply different names.